Justin Bieber has expressed his surprise after discovering that Kanye West doesn't use a mobile phone.

The teen pop sensation said he found out the rapper's unusual quirk after West remixed his hit 'Runaway Love' last year.

"It's funny, because he doesn't even use a phone; he just sends e-mail," Bieber told MTV News. "It's so crazy. I'm like, 'How can you not use a phone?'"

Bieber went on to call West's remix “amazing” and described the rapper as a “cool guy”, adding: “He's just really laid back and just nice”.

It was recently reported that West was working with Bieber on his next studio album.

His 'Runaway Love' remix, which also features Raekwon, is included on Bieber's forthcoming album, 'Never Say Never – The Remixes', due out on February 14.

(by Jason Gregory)